DVI-D to DVI-D port using VGA cable

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morani

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Jan 25, 2015
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Hello,
I have a cable (with VGA connectors at both ends) which i want to use to connect my DVI-D port at video card to my DVI-D port at a secondary monitor. My primary port is consuming the VGA port at video card.
If i use two DVI-D to VGA passive interface connectors (one at each end of the VGA cable), would it be possible for me to run the secondary monitor successfully on the digital signal??
 
Solution
N
No, definitely not. First look at this http://www.buildmyowncabin.com/electrical/cable-pinouts .
VGA cable is a completely analog signal thing, while DVI is mainly digital. I said mainly, because actually it is (by standard) or more likely it could be (in real life) a mixed thing - able to carry both digital and analog type of signalling.
Thus, you can make DVI cable carry the analog signal, but not vice versa.
At one moment I thought - if you could force your monitor to think it is receiving the analog signal on DVI port, you could, but then changed my mind, because you deffinitely cannot. Because your monitor will (almost 100% sure) use different subset of DVI standard called DVI-D (see the link above) (lacking pins neccessary for...
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boju

boju

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Jul 7, 2008
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DVI-D is digital only so wont work if you had VGA passive adapters in between.

If you had this connection;
DVI-I_single_link_thumb336.jpg


As most GPU's do have the horizontal bar between those four pins then that will work. DVI-I does both digital and analog.
 
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nufis

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Jan 25, 2012
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No, definitely not. First look at this http://www.buildmyowncabin.com/electrical/cable-pinouts .
VGA cable is a completely analog signal thing, while DVI is mainly digital. I said mainly, because actually it is (by standard) or more likely it could be (in real life) a mixed thing - able to carry both digital and analog type of signalling.
Thus, you can make DVI cable carry the analog signal, but not vice versa.
At one moment I thought - if you could force your monitor to think it is receiving the analog signal on DVI port, you could, but then changed my mind, because you deffinitely cannot. Because your monitor will (almost 100% sure) use different subset of DVI standard called DVI-D (see the link above) (lacking pins neccessary for analog signal transmission completely), and even if it has complete DVI-I connector, it will not have (again almost 100% sure) the analog signal pins connected anywhere internally.
 
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Solution
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morani

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Jan 25, 2015
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Thank you everyone. I've got my answer that even if i have DVI-D connectors at both ends, setup is useless if i have analog (VGA) cable in between. Thank you again.
 
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